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1. Order of operations apply as usual (brackets, then times and divide, then plus and minus).
2. Two minuses multiplied together become positive. For example, in this case, -15 x -3 = 15 x 3 = 45. This included -(-6) = 6 where the two minuses just cancel each other out.
2. Two minuses multiplied together become positive. For example, in this case, -15 x -3 = 15 x 3 = 45. This included -(-6) = 6 where the two minuses just cancel each other out.